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Related Concept Videos

Endocarditis II: Clinical Features of Infective Endocarditis01:25

Endocarditis II: Clinical Features of Infective Endocarditis

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Endocarditis can present various clinical features depending on the causative organism and the patient's underlying health conditions. Initially, the clinical features of infective endocarditis develop gradually, presenting with nonspecific symptoms that can be easily mistaken for other illnesses.General SymptomsEarly symptoms of infective endocarditis are fever, chills, weakness, malaise, fatigue, and weight loss. These symptoms reflect the systemic nature of the infection and the body's...
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Endocarditis I: Introduction01:25

Endocarditis I: Introduction

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Introduction:Endocarditis is the infection of the endocardium, the inner lining of the heart and its valves. When the heart muscle is involved, the condition is termed myocarditis, while an infection of the outer lining is called pericarditis. Infective endocarditis (IE) primarily affects the endocardium, where pathogens adhere to the valves or lining, forming vegetation that can lead to severe complications. Infective endocarditis occurs when microorganisms, usually bacteria from other body...
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Endocarditis III: Medical Management01:18

Endocarditis III: Medical Management

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Infective endocarditis management involves a multifaceted approach encompassing infection prevention, lifestyle modifications, pharmacological therapy, and surgical management.Infection Prevention:Hand Hygiene: Thorough handwashing is crucial to prevent the spread of infection. Hand hygiene should be performed regularly, especially before and after using the restroom.Oral Hygiene: Good oral hygiene is essential. It includes brushing teeth immediately after waking up and before bed, flossing...
49
Endocarditis IV: Nursing Management01:29

Endocarditis IV: Nursing Management

90
Infective endocarditis (IE) is a chronic infection of the heart's endocardium, primarily affecting the heart valves. A detailed nursing assessment for a patient with IE involves collecting subjective and objective data to ensure an accurate diagnosis and timely intervention.Subjective DataThe nurse gathers information about the patient's symptoms and complaints during the subjective assessment. Patients with infective endocarditis often report non-specific symptoms that can mimic other...
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Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies01:22

Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies

122
The key clinical manifestations of Rheumatic heart disease (RHD) include several distinct cardiac symptoms.Carditis, a hallmark of acute rheumatic fever, involves inflammation of the heart's endocardium, myocardium, and pericardium. Chronic RHD often results from recurrent episodes of carditis. Its symptoms include the following:Murmurs are caused by valvular damage, especially to the mitral and aortic valves. Mitral stenosis or regurgitation is common, with characteristic heart murmurs...
122
Myocarditis I: Introduction01:21

Myocarditis I: Introduction

71
Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
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Updated: Oct 20, 2025

Visualization of Streptococcus pneumoniae within Cardiac Microlesions and Subsequent Cardiac Remodeling
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Enterococcal Endocarditis: Hiding in Plain Sight.

Aaron M T Barnes1,2, Kristi L Frank1,3, Gary M Dunny1

  • 1Department of Microbiology and Immunology, University of Minnesota School of Medicine, Minneapolis, MN, United States.

Frontiers in Cellular and Infection Microbiology
|September 16, 2021
PubMed
Summary
This summary is machine-generated.

Enterococcus faecalis can form biofilms on undamaged heart surfaces, contributing to endocarditis. This ability may also enable its persistence in the gut, acting as a reservoir for systemic infections.

Keywords:
biofilmhost colonizationimmune evasioninfection sourcemicrobial adherence

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Area of Science:

  • Microbiology
  • Pathogenesis
  • Bacterial biofilms

Background:

  • Enterococcus faecalis is a significant opportunistic pathogen.
  • Biofilm formation is crucial for E. faecalis infections and commensal persistence.
  • Endocarditis models typically assume pre-existing cardiac damage.

Purpose of the Study:

  • To review evidence of E. faecalis biofilm formation on undamaged endovascular surfaces.
  • To explore similarities between endocardial and gastrointestinal biofilms.
  • To propose a mechanism for E. faecalis persistence and infection reservoir.

Main Methods:

  • Review of historical and contemporary animal model studies.
  • Analysis of biofilm formation on endovascular endothelium.
  • Comparison of biofilm morphology on different host tissues.

Main Results:

  • E. faecalis robustly forms biofilms on undamaged endovascular endothelium.
  • Biofilms are encased in a bacterially-derived extracellular matrix.
  • Similar biofilm structures are observed on GI epithelium.

Conclusions:

  • E. faecalis can directly initiate biofilm formation on healthy heart tissue.
  • Commensal GI colonization may serve as an undetected reservoir for endocarditis.
  • Bacterial biofilms on host tissues are key to E. faecalis persistence.